[Construction, identification and expression of recombinant eukaryotic vector pEGFP-BMI-1]

Area of Science:

• Molecular Biology
• Cancer Research
• Gene Expression

Background:

• BMI-1 is an oncogene involved in cell proliferation and cancer development.
• P16INK4a is a tumor suppressor gene often silenced in cancers.
• Understanding BMI-1's role in cancer requires effective expression tools.

Purpose of the Study:

• To construct and validate the mammalian expression vector pEGFP-BMI-1.
• To confirm the expression of the BMI-1-EGFP fusion protein in HeLa cells.
• To investigate the effect of pEGFP-BMI-1 on P16INK4a mRNA levels.

Main Methods:

• RT-PCR to obtain BMI-1 cDNA.
• Cloning into pEGFP-N1 vector.
• Restriction enzyme digestion, PCR, and DNA sequencing for verification.
• Lipofectamine 2000 transfection into HeLa cells.
• EGFP fluorescence and Western blot for protein expression analysis.
• SYBR Green I real-time RT-PCR for P16INK4a mRNA quantification.

Main Results:

• Successful construction and verification of the pEGFP-BMI-1 recombinant plasmid.
• Demonstrated expression of BMI-1-EGFP fusion protein in transfected HeLa cells.
• Significant reduction of P16INK4a mRNA expression to 9.2% in HeLa cells.

Conclusions:

• The pEGFP-BMI-1 mammalian expression vector was successfully constructed and validated.
• The vector facilitates BMI-1-EGFP fusion protein expression in human cervical cancer cells.
• This study provides a foundation for further investigation into BMI-1's biological functions and therapeutic potential in cancer.